Them British rock groups is the only boys with girly hair, and we're gonna burn their albums. Tell me why you think that's a boy?

Primarily because that's a boy goth's outfit, not a girl goth's, which I say as someone who wasn't goth herself but spent a fair amount of time around them in high school. It's what Brandon Lee wore in The Crow.

Secondly, that ratty hair at the top of his head has boy-coarseness. Girls treat their long hair better, even when they're fighting the Man's beauty norms. And third, the shirt makes it hard to tell, but those would be some very flat tits for a girl, even a flat-chested one.

Well the first thing I looked for is boobs, as I do in any picture. Whazat? The Sphinx. Got boobs? I love the small boobs, so I don't have to chase the nipple around when things get active. Uh... back to the picture at hand.
My contact with the offline world predates Emos, so I didn't know there was male or female wardrobes.
Ratty hair? All I see is a rather casual part but transporting a raven I imagine that would come with the territory.
There's a lot of things you see that mere mortals never notice, so I'll bow to your superior skills of detection and youth culture knowledge.
If I see the little bastard I'll kick his ass for posing as a girl.

All right, well, I just spent way too long trying to track down the origin of the image (appears to have been taken in the Russian metro), but there's too much online noise now with the thing gone viral. Everyone seems to agree it's a girl.

Everyone except me, that is. I can only hope that the poor androgynous lad comes forward to claim his fame.

I'm betting on you. The rest of us superficial boobs pay good money to find out she has a larger dick than we do, because we take her at face value... through beer goggles. Every time it happens I get angry, but rationalize I already spent the $20, and like Digr says, $20 is $20.